@techreport{Ribe1980,
author = {Ribe, H. and Schultz, T.P.},
title= {Migrant and native fertility in Colombia in 1973: Are migrants selected according to their reproductive preferences?},
year = {1980},
URL = {http://www.econ.yale.edu/growth_pdf/cdp355.pdf},
publisher = {Yale University, Economic Growth Center},
address = {New Haven},
number = {Center discussion paper no. 355},
}